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Anleitung Zusammenfassung
The firmware helps to initialize the processor hardware and boot the operating system software. You can perform certain configuration tasks, such as recovering a lost password or downloading software over the console port, by using the ROM monitor. If there is no Cisco IOS software image loaded on the router, the ROM monitor runs the router. This appendix contains the following sections: • Entering the ROM Monitor • ROM Monitor Commands • Command Descriptions • Disaster Recovery with TFTP Download • Configuration Register • Console Download Entering the ROM Monitor To use the ROM monitor, you must be using a terminal or PC that is connected to the router by means of the console port. Refer to the installation chapter in the Hardware Installation Guide for your router, for information about connecting the router to a PC or terminal. 78-5407-03 Cisco 1700 Series Router Software Configuration Guide B-1 Appendix B ROM Monitor Entering the ROM Monitor Follow these steps to configure the router to boot up in ROM monitor mode the next time it is rebooted. Command Router Prompt Task enable Router> If there is an enable password configured, enter the enable command and the enable password to enter privileged EXEC mode. configure terminal Router# Enter global configuration mode. config-reg 0x0 Router(config)# Reset the configuration register. exit Router(config)# Exit global configuration mode. reload Router# Reboot the router with the new configuration register value. The router remains in ROM monitor and does not boot the Cisco IOS software. As long as the configuration value is 0x0, you must manually boot the operating system from the console. See the boot command in the “Command Descriptions” section on page B-4. rommon 1> After the router reboots, it is in ROM monitor mode. The number in the prompt increments with each new line. Step 1 Step 2 Step 3 Step 4 Step 5 Step 6 Timesaver A break (system interrupt) is always enabled for 60 seconds after the router reboots, regardless of its setting (on or off) in the configuration register. During this 60-second window, you can break to the ROM monitor prompt by pressing the Break key. B-2 Cisco 1700 Series Router Software Configuration Guide 78-5407-03 Appendix B ROM Monitor ROM Monitor Commands ROM Monitor Commands Enter ? or help at the ROM monitor prompt to display a list of available commands and options, as follows: rommon 1 > ? alias set and display aliases command boot boot up an external process break set/show/clear the breakpoint confreg configuration register utility cont continue executing a downloaded image context display the context of a loaded image cookie display contents of cookie PROM in hex dev list the device table dir list files in file system dis display instruction stream dnld serial download a program module frame print out a selected stack frame help monitor builtin command help history monitor command history meminfo main memory information repeat repeat a monitor command reset system reset set display the monitor variables stack produce a stack trace sync write monitor environment to NVRAM sysret print out info from last system return tftpdnld tftp image download unalias unset an alias unset unset a monitor variable xmodem x/ymodem image download Commands are case sensitive. You can halt any command by pressing the Break key on a terminal. If you are using a PC, most terminal emulation programs halt a command when you press the Ctrl and the Break keys at the same time. If you are using another type of terminal emulator or terminal emulation software, refer to the documentation for that product for information on how to send a Break command. Cisco 1700 Series Router Software Configuration Guide 78-5407-03 B-3 Appendix B ROM Monitor Command Descriptions Command Descriptions Table B-1 describes commonly used ROM monitor commands. TableB-1 Common ROM Monitor Commands Command Description help or ? Displays a summary of all available ROM monitor commands. -? Displays information about command syntax, for example: rommon 16 > dis -? usage : dis [addr] [length] The output for this command is slightly different for the xmodem download command: rommon 11 > xmodem -? xmodem: illegal option -- ? usage: xmodem [-cyrx] destination filename -c CRC-16 -y ymodem-batch protocol -r copy image to dram for launch -x do not launch on download completion reset or i Resets and initializes the router, similar to a power-up. dev Lists boot device identifications on the router. For example: rommon 2> dev Devices in device table: id name flash: flash eprom: eprom dir device: Lists the files on the named device (Flash, for example): rommon 1> dir flash: File size Checksum File name 7729736 bytes (0x75f248) 0xb86d c1700-bk9no3r2sy7-mz.0412 B-4 Cisco 1700 Series Router Software Configuration Guide 78-5407-03 Appendix B ROM Monitor Disaster Recovery with TFTP Download Table B-2 describes the ROM monitor boot commands. For more information about the ROM monitor boot commands,...